Mail says I am bouncing when I try to send to group ... but I receive group e-mails and settings say I am OK.?

I am a group moderator. I receive e-mails from the group at my registered yahoo mail account. When I try to send to the group I receive an e-mail that says I am bouncing. When I go to the link in the e-mail it shows me the original and two additional e-mail addresses. "Show History" shows that they are all "reactivated." Yet I still can't send to my group. Help!?